- Clifford Evens
- Clifford Ford
- Clifford Ford
- Clifford Hunt
- Clifford MacKay McEwen
- Clifford O. Hunt
- Clifford Olson's Right to Parole Hearing Sparks Outrage
- Clifford Poole
- Clifford von Kuster
- Clifford William Robinson
- Clifton F. Carbin
- Climate
- Climate and Society
- Climate Change
- Climate Change (Plain-Language Summary)